黏性应力对液体扩张抛撒影响的实验研究
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摘要
利用组合式激波管和高速摄影机,获得不同工况的气液界面不稳定性发展直至发生首次破碎的高速摄影照片。实验结果表明,RT不稳定性和RM不稳定性均随时间增长。在扰动波发展的过程中,两相混合区中气泡的前缘基本保持圆形,而尖钉的头部在发展过程中有雾化的迹象。由于黏性的存在,不稳定性的发展将受到抑制,且随着黏性系数的增大,扰动波的增长系数随之减小。
With the combined shock tube and high-speed camera,high-speed photographs of the instability on the interface of gas / liquid and primary breakup in different experimental conditions were obtained. It was shown that the RT instability and RM instability were both increased with the time. During the increasement of disturbance waves,the front of bubbles kept circle and atomization taken place at the front of spikes. The development of instability was restrained for the existence of viscous stress. And the growth factor was decreased with the increasement of viscous coefficient.
With the combined shock tube and high-speed camera,high-speed photographs of the instability on the interface of gas / liquid and primary breakup in different experimental conditions were obtained. It was shown that the RT instability and RM instability were both increased with the time. During the increasement of disturbance waves,the front of bubbles kept circle and atomization taken place at the front of spikes. The development of instability was restrained for the existence of viscous stress. And the growth factor was decreased with the increasement of viscous coefficient.
引文
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2 Cabot W H,Cook A W.Reynolds number effects on Rayleigh-Taylor instability with possible implications or type Ia super novae.Nature:Physics,2006;2:562—568
3 薛社生,刘家骢,秦承森,等.燃料爆炸抛撒成雾的实验与数值研究.爆炸与冲击,2001;21(4):272—276Xue S S,Liu J C,Qin C S,et al.Experimental and numerical investigation on explosive dispersal and cloud forming.Explosion and Shock Waves,2001;21(4):272—276
4 薛社生,刘家骢.FAE云雾形成过程的实验研究.火炸药学报,1997;(2):11—12Xue S S,Liu J C.Experimental study on the formation of FAE cloud.Chinese Journal of Explosives and Propellants,1997;(2):11 —12
5 黄文斌,邹立勇,刘金宏,等.初始扰动对于气液界面RayleighTaylor不稳定性发展的影响.实验流体力学,2010;24(2):39 —41Huang W B,Zou L Y,Liu J H,et al.Effects of initial perturbations on Rayleigh-Taylor instability growth at gas-liquid interface.Journal of Experiments in Fluid Mechanics,2010;24(3):39—41
6 邹立勇,王建,刘金宏,等.高压气体膨胀驱动Air-Water界面Rayleigh-Taylor不稳定性实验研究.高能量密度物理,2008;(2):49—53Zou L Y,Wang J,Liu J H,et al.Experimental study on RayleighTaylor instability of air-water interface driven by high pressure gas.High Energy Density Physics,2008;(2):49—53
7 刘金宏,邹立勇,柏劲松,等.激波冲击下air/SF6界面的Richtmyer-Meshkov不稳定性.爆炸与冲击,2011;(3):135—140Liu J H,Zou L Y,Bai J S,et al.Richtmyer-Meshkov instability of shock-accelerated air/SF6 interface.Explosion and Shock Waves,2011;31(3):135—140
8 施红辉,卓启威.Richtmyer-Meshkov不稳定性流体混合区发展的实验研究.力学学报,2007;39(3):417—421Shi H H,Zuo Q W.Evolution of the fluid mixing zone in richtymerMeshkov instability at a gas/liquid interface.Chinese Journal of Theoretical and Applied Mechanics,2007;39(5):417—421
9 施红辉,杜凯,王超,等.不同密度梯度的多层流体界面上的Richtmyer-Meshkov不稳定性研究.实验流体力学,2011;25(5):45 —50Shi H H,Du K,Wang C,et al.Experimental research on Richtmyer-Meshkov instability at the multi-layered fluids interfaces with different density gradients.Journal of Experiments in Fluid Mechanics,2011;25(5):45—50
10 王继海,二维非定常流和激波.北京:科学出版社,1994Wang J H.Two dimension unsteady flow and shock wave.Beijing:Science Press,1994